Also want to note that an allergy test may not pick up a GI sensitivity to dairy. Both of my kids have a dairy intolerance - not a true allergy - but that doesn't make it any less upsetting to them. We saw a GI specialist for my son after his allergy test came back negative and she confirmed he has dairy and soy intolerances based on his body's reactions to them. So we kept it out of his system and he does fine without

This is us also and so important to note...many docs don't even understand this...babies/kids can have some very bad reactions to a food and NOT test positive on allergy testing. My ds has been tested by skin twice and blood once and does not test positive to cow's milk protein yet the poor little guy cannot even tolerate trace amounts.

There are different types of allergies and traditional allergy testing will only look for IgE-mediated allergies. When any other part of the immune system is responsible for the reaction, it is considered a non-IgE allergy. Most of the time when GI symptoms are the predominant symptoms, the allergy is non-IgE. Bad news is, IME, non-IgE allergies tend to be the kids who are the most sensitive to the allergens. Good news is, these allergies tend to be outgrown better than IgE allergies and they also are not life threatening.